KR20160140502A - Antenna unit for wireless power transfer and Wireless power transmission module having the same - Google Patents

Abstract

Provided are an antenna unit for transmitting wireless power and a wireless power transmission module having the same. The antenna unit for transmitting wireless power according to an exemplary embodiment of the present invention comprises: a first coil unit which is configured in at least three layers of planar coils, wherein conductive members with a predetermined length are wound around the planar coils, and at least one conductive member having a pair of a first lead portion and a second lead portion is wound in multiple times at both ends of the first coil unit such that the first coil unit is formed in two layers of the planar coils; and a second coil unit in which least one conductive member having a pair of a third lead portion and a fourth lead portion is wound in multiple times at both ends of the second coil unit such that the second coil unit is formed in at least one layer of the planar coils. The first coil unit can be stacked on the second coil unit such that one surface of the first coil unit touches one surface of the second coil unit by area, and the second lead portion can be directly connected with the third lead portion. According to the present invention, a charging efficiency can be improved while satisfying conditions necessary for performing wireless charging within a restricted volume.

Description

Technical Field [0001] The present invention relates to an antenna unit for wireless power transmission and an antenna unit for wireless power transmission having the wireless power transmission module.

The present invention relates to an antenna unit for wireless power transmission and a wireless power transmission module including the same.

Recently, the portable terminal has a wireless charging function which can charge a spent battery wirelessly. Such wireless charging is performed by a wireless power receiving module built in the portable terminal and a wireless power transmitting module supplying power to the wireless power receiving module.

That is, the power is transmitted to the wireless power receiving module side using the inductive coupling method based on the electromagnetic induction phenomenon through the wireless power signal transmitted from the wireless power transmitting module, thereby charging the battery built in the portable terminal.

 At this time, the wireless power signal is transmitted and received through an antenna provided in the wireless power transmission module and the wireless power reception module, respectively. The antenna may be formed in a predetermined pattern on one side of the circuit board or may be in the form of a flat plate coil in which a wire made of a conductive material is wound a plurality of times.

Meanwhile, since the wireless power receiving module is embedded in a portable terminal having a limited size, the receiving antenna included in the wireless power receiving module is also limited in size. Accordingly, the transmission antenna of the wireless power transmission module matched with the reception antenna also has to be limited in size (particularly, area). Therefore, in order to increase the wireless charging efficiency, it is necessary to lower the resistance while satisfying the required inductance at a predetermined size.

For example, when the antenna is formed of a flat coil, the cross-sectional area is relatively increased as compared with a coil having a thin wire diameter, so that the overall resistance can be lowered even if the same length is used. However, when the overall size of the flat coil is limited, the number of turns of the coil to be wound must be reduced if the coil diameter is increased, and the overall length of the coil to be wound must also be reduced.

As a result, the resistance can be lowered, but the inductance required for wireless charging can not be satisfied.

KR 10-2013-0119585 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an antenna unit for wireless power transmission that can increase charging efficiency while satisfying conditions required for wireless charging within a limited size when the antenna unit is formed of a flat- The present invention is directed to a wireless power transmission module.

In order to solve the above-described problems, the present invention is characterized in that a flat-plate type coil in which a conductive member having a predetermined length is wound is composed of at least three layers or more, and a pair of first and second lead portions A first coil unit having one conductive member wound with a plurality of turns and formed of a two-layered plate-like coil; And a second coil unit which is formed by one or more flat plate type coils by winding a plurality of times of one conductive member having a pair of third lead portions and fourth lead portions on both end sides, Wherein the first coil unit and the second coil unit are stacked on the first coil unit and the second coil unit so that one surface thereof is in contact with one surface of the second coil unit and the second lead unit is directly connected to the third lead unit.

Also, the second coil unit may be formed of a single-layer flat coil.

The second lead portion may be a lead portion extending a predetermined length outward from a side portion of the flat coil wound on the second coil unit of the first coil unit, And the fourth lead portion may be a lead portion extending from a central portion of the body of the second coil unit so as to cross one surface of the second coil unit that is not in contact with the first coil unit .

In addition, the second coil unit may be formed of a two-layered plate-type coil in which one conductive member is wound a plurality of times.

The antenna unit for wireless power transmission may be configured such that the first coil unit is formed of a flat coil of four layers laminated on one surface of the second coil unit and the second and third lead parts are formed on the four layers A plurality of plate-shaped coils of the plate-type coil, and a plurality of plate-shaped coils.

In addition, an adhesive layer may be disposed on the contact surface of the first coil unit and the second coil unit, and the adhesive layer may include a nonconductive component.

According to another aspect of the present invention, there is provided an antenna unit for wireless power transmission, wherein a flat plate coil in which a conductive member having a predetermined length is wound is constituted by at least three layers or more and transmits radio power; And a shielding unit disposed on one surface of the antenna unit for wireless power transmission, wherein the antenna unit for wireless power transmission has one conductive member having a pair of first lead portions and second lead portions on both end sides, A first coil unit formed by a plurality of turns of a planar coil; And a second coil unit which is formed by one or more flat plate type coils by winding a plurality of times of one conductive member having a pair of third lead portions and fourth lead portions on both end sides, The first coil unit and the second coil unit are stacked on the first coil unit and the second coil unit so that one surface thereof is in contact with one surface of the second coil unit and the second lead unit is directly connected to the third lead unit.

In addition, the shielding unit may include a receiving groove formed in a certain depth on one surface thereof, and a part or an entire length of the fourth lead portion may be inserted into the receiving groove.

The shielding unit may be any one of a ribbon sheet, a ferrite sheet and a polymer sheet including at least one of an amorphous alloy and a nanocrystalline alloy. The ferrite sheet may be one of Mn-Zn ferrite and Ni- Or more species.

According to the present invention, it is possible to increase the charging efficiency by reducing the overall resistance while satisfying the inductance required for wireless charging even within a limited size by using a flat coil of three or more layers as the antenna for wireless power transmission.

1 is a block diagram of a wireless power transmission module according to an embodiment of the present invention;
Fig. 2 is a sectional view of Fig. 1,
3 illustrates an antenna unit for wireless power transmission according to an embodiment of the present invention,
FIG. 4 is a view illustrating a state in which the first coil unit and the second coil unit are separated from each other in FIG. 3;
5 is a view illustrating an antenna unit for wireless power transmission according to another embodiment of the present invention;
FIG. 6 is a view illustrating a state in which the first coil unit and the second coil unit are separated in FIG. 5;
FIG. 7 is a diagram illustrating a case where three antenna units for wireless power transmission are provided in a wireless power transmission module according to an embodiment of the present invention;
Fig. 8 is a cross-sectional view of Fig. 7,
FIG. 9 is a detailed cross-sectional view illustrating a case where a shielding unit applied to a wireless power transmission module according to the present invention is composed of multiple layers.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

The wireless power transmission modules 100 and 200 according to an embodiment of the present invention include the wireless power transmission antenna units 110 and 210 and the shielding unit 120 as shown in FIGS.

The wireless power transmission antenna units 110 and 210 may be disposed on at least one surface of the shielding unit 120 and may be a flat plate coil having a conductive member having a predetermined length wound a plurality of times, May be fixed to one surface of the substrate 120 by an adhesive layer 124.

In the present invention, the conductive member may be made of a conductive metal such as copper, and may be formed of a single strand having a predetermined wire diameter, or a plurality of strands may be twisted along the longitudinal direction.

The antenna units 110 and 210 for wireless power transmission use a transmission coil for charging the battery of the electronic device in a wireless manner using an inductive coupling method or a self resonance method based on electromagnetic induction phenomenon by sending a wireless power signal to the electronic device side Tx coil).

At this time, the antenna units 110 and 210 for wireless power transmission according to the present invention may be configured such that the conductive member is wound clockwise or counterclockwise to form three or more layered coils of polygonal shape such as circular, elliptical, spiral, As shown in FIG.

The antenna units 110 and 210 for radio power transmission are stacked so as to face the first coil unit 111 and one surface of the first coil unit 111 and are connected to the first coil unit 111 in series The second coil unit 112, 212 may be provided.

Here, the first coil unit 111 and the second coil unit 112 and 212 may be formed by winding one conductive member a plurality of times.

That is, the first coil unit 111 may be formed of a two-layered plate-type coil by winding one conductive member a plurality of times, and the plate-type coil having the both ends constituting the lower layer and the plate- The first lead portion 111a and the second lead portion 111b may be extended by a predetermined length from the body side portion of the main body portion.

Here, the second lead portion 111b of the first coil unit 111 may be a plate-like coil constituting the upper layer and a plate-like coil constituting the lower layer, And may be a lead portion drawn outward from the body of the coil.

Also, the second coil units 112 and 212 may be formed of a plate-shaped coil having a plurality of turns of one conductive member having a third lead portion 112a and a fourth lead portion 112b on both end sides.

1 to 4, the second coil units 112 and 212 may be formed as a flat coil of a single layer. As shown in FIGS. 5 to 8, the first and second coil units 111 and 112, It may be formed of a two-layered flat coil.

Here, when the second coil unit 112 is formed of a flat-plate type coil, the third lead portion 112a may extend a certain length outward from the body side of the flat coil, (112b) may extend from a central portion of the flat coil type body to cross one side of the flat type coil body.

In the case where the second coil unit 212 is formed of a two-layered plate-type coil, the plate-type coil forming the lower layer and the plate- The third lead portion 112a and the fourth lead portion 112b may extend from the body side portion of the first lead portion 112b by a predetermined length.

The second coil unit 112 and the second coil unit 112 are stacked on one surface of the first coil unit 111 and then the second lead unit 111b and the second coil unit 112 and 212 of the first coil unit 111, The antenna units 110 and 210 for wireless power transmission according to the present invention can be realized by stacking three or four layers of flat type coils.

The first coil unit 111 and the second coil units 112 and 212 are disposed on the contact surfaces of the first coil unit 111 and the second coil unit 112 and 212 with an adhesive layer 113 containing a non- Can be integrated.

At this time, the first coil unit 111 and the second coil unit 112, 212 are arranged such that any one selected from the first lead portion and the second lead portion, and any one selected from the third lead portion and the fourth lead portion, May be in the form of being connected.

The second lead portion 111b of the first coil unit 111 and the third lead portion 112a of the second coil unit 112 and 212 may be connected to each other, And the third lead portion 112a may be connected to each other through soldering or welding.

This is because when the second coil unit 112 formed of a flat plate coil of a single layer is laminated on one surface of the first coil unit 111 and one surface of the first coil unit 111 and one surface of the second coil unit 112 So that it can be completely adhered.

In other words, when the second coil unit 112 is formed of a single-layered flat coil, the fourth lead part 112b extending outward from the center of the body of the flat coil constituting the second coil unit 112, The first coil unit 111 and the second coil unit 111 may be combined with each other. Thus, the contact area between the first coil unit 111 and the second coil unit 112 is widened, so that the fixing force by the adhesive layer 113 can be increased.

In addition, even when the second coil unit 212 formed of two flat plate type coils is laminated on one surface of the first coil unit 111, the lead portions extending from the adjacent flat type coils are connected to each other, The length of the lead portions connected to each other can be minimized.

Accordingly, the second lead portion 111b and the third lead portion 112a may serve as a connection portion for electrically connecting the first coil unit 111 and the second coil unit 112, 212 to each other The first lead portion 111a of the first coil unit 111 and the fourth lead portion 112b of the second coil unit 112 and 212 may serve as an input and output of power supplied from the outside . A terminal portion for electrically connecting to an external device (e.g., a circuit board) may be separately formed on the end sides of the first lead portion 111a and the fourth lead portion 112b.

As described above, the antenna units 110 and 210 for wireless power transmission according to the present invention include a first coil unit 111 formed of a two-layer flat coil, a second coil unit 112 and 212 formed of a single- And the first coil unit 111 and the second coil unit 112, 212 are connected in series to each other, the antenna for wireless power transmission that performs the role of the radiator is realized as a flat coil of three or more layers The conductive member constituting the flat coil can have a larger wire diameter without increasing the size (or the winding area) of the flat coil, compared with a conventional single-layer or two-layer flat coil.

As a result, the cross-sectional area of the conductive member used increases relative to the conventional one, thereby reducing the internal resistance, thereby reducing heat generated in the antenna units 110 and 210 for wireless power transmission during wireless charging. The increase in power not only shortens the charging time but also increases the overall charging efficiency.

In addition, since the antenna units 110 and 210 for wireless power transmission according to the present invention are formed of three or more layered coils, even if the diameter of the conductive member used increases, the reduced length of the conductive member wound on the same layer increases . ≪ / RTI > As a result, the total length of the conductive members constituting the antenna units 110 and 210 for wireless power transmission can have the same length as that of the conventional antenna, or a longer length can be used. Therefore, various satisfactory inductances can be achieved, have.

In the drawings and the description, the antenna units 110 and 210 for wireless power transmission according to the present invention are shown and described as being implemented by three-layer or four-layered flat coil, but the present invention is not limited thereto, and at least one first coil unit 111 and the second coil units 112, 212 may be suitably used and the lamination and connection method described above may be applied to form a flat coil of five or more layers.

The shielding unit 120 is a plate-shaped member having a predetermined area and may be disposed on one side of the antenna units 110 and 210 for wireless power transmission.

The shielding unit 120 shields the magnetic field generated by the antenna units 110 and 210 of the wireless power transmission to increase the collection speed of the magnetic field so that the antenna units 110 and 210 for wireless power transmission operating in a predetermined frequency band Performance can be improved.

That is, the shielding unit 120 may be used for the wireless power transmission in the frequency band of 100 to 350 kHz, or in the wireless power transmission in the corresponding frequency band during the wireless charging by self- So as to enhance the performance of the antenna units 110 and 210.

For this, the shielding unit 120 may be made of a magnetic material so as to shield the magnetic field.

In this case, the shielding unit 120 may have a magnetic permeability in the range of 300 to 3500 when the antenna units 110 and 210 for radio power transmission operate in a frequency band of 100 to 350 kHz, which is a low frequency band, If the units 110 and 210 operate at a frequency of 6.78 MHz, they can have a permeability in the range of 100 to 350.

For example, the shielding unit 120 may include a Mn-Zn ferrite sheet having a magnetic permeability in the range of 100 to 350 kHz and 2000 to 3500 in a low frequency band, a ribbon sheet including at least one of an amorphous alloy and a nano- Can be used. The shielding unit 120 may be a Ni-Zn ferrite sheet having a magnetic permeability ranging from 300 to 1500 at a frequency of 100 to 350 kHz which is a low frequency band, a ribbon sheet including at least one of an amorphous alloy and a nano- Can be used. In addition, the shielding unit 120 may be a ribbon sheet, a polymer sheet, or the like including at least one of Ni-Zn ferrite sheet, amorphous alloy and nano-crystal alloy having permeability ranging from 100 to 350 at 6.78 MHz .

Here, the amorphous alloy or the nano-crystal alloy may be a Fe-based or a Co-based magnetic alloy, and the amorphous alloy and the nano-crystal alloy may include a three-element alloy or a five-element alloy. For example, the three-element alloy may include Fe, Si, and B, and the five-element alloy may include Fe, Si, B, Cu, and Nb.

9, the shielding unit 120 'may include a plurality of sheets 121a stacked in layers via an adhesive layer 121b, and the plurality of sheets may include amorphous alloy and nanocrystalline Or a ribbon sheet containing at least one kind of alloy.

In addition, the shielding units 120 and 120 'may be formed as a plurality of micro-pieces so as to suppress the generation of eddy currents, and the plurality of micro-pieces may be entirely insulated or partially insulated from each other And each piece can be randomly randomized.

The adhesive layer 121b may include a non-conductive component when a plurality of sheets 121a, in which the shielding units 120 and 120 'are separated into fine pieces, are stacked in multiple layers via the adhesive layer 121b.

At this time, the adhesive layer 121b may penetrate between the pair of sheets stacked together to insulate the plurality of microfits constituting each sheet from each other. Here, the adhesive layer 121b may be formed of an adhesive or may be provided on one side or both sides of a substrate in the form of a film coated with an adhesive.

In addition, the shielding unit 120, 120 'may have a protective film 123 disposed on at least one of the upper surface and the lower surface.

Here, it is to be noted that the magnetic permeability and the kind of the magnetic material of the shielding unit 120 are not limited to the magnetic permeability and the magnetic material mentioned above, but a magnetic material having a suitable permeability according to the design conditions can be used.

Meanwhile, when the antenna unit 110 for wireless power transmission according to the present invention is formed of an odd number of flat plate type coils, for example, three flat plate type coils, the receiving unit may be formed in the shielding unit 120.

Here, the receiving portion may be a receiving groove 122 (see FIG. 1) formed to be recessed from a surface of the shielding unit 120 (see FIG. 1), and a predetermined lengthwise incision is formed inward from one side edge of the shielding unit 120 (Not shown).

When the fourth lead portion 112b of the second coil unit 112 extends from the central portion of the plate-type coil and is disposed across the body of the plate-type coil, the fourth lead portion 112b, Can be inserted and arranged. When the antenna unit 110 for wireless power transmission is attached to one surface of the shielding unit 120, the thickness of the fourth lead portion 112b is received so that one surface of the antenna units 110 and 210 is bonded to the adhesive layers 113 and 124 The shielding unit 120 can be fully interfaced to one side of the shielding unit 120 via the through-hole. Therefore, the total thickness of the wireless power transmission modules 100 and 200 can be further reduced by preventing an increase in thickness due to the thickness of the fourth lead portion 112b.

The wireless power transmission antenna units 110 and 210 and the wireless power transmission modules 100 and 200 according to an embodiment of the present invention may be applied to wireless charging using a Qi or PMA magnetic induction method, It can be applied to wireless charging using the same self-resonant method.

In addition, the antenna units 110 and 210 for wireless power transmission according to the present invention may be used as a receiving coil (Rx coil) for receiving wireless power. That is, when the above-described wireless power transmission antenna units 110 and 210 are used as a reception coil (Rx coil) for receiving wireless power using an inductive coupling method based on the electromagnetic induction phenomenon or a self-resonance method, And the shielding sheet included in the wireless power receiving module may also be used as the shielding sheet described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100,200: Wireless power transmission module
110, 210: Antenna unit for wireless power transmission
111: first coil unit 111a: first lead part
111b: second lead portion 112, 212: second coil unit
112a: third lead portion 112b: fourth lead portion
113: adhesive layer 120, 120 ': shielding unit
121a: ribbon sheet 121b: adhesive layer
122: receiving groove 123: protective film
124: Adhesive layer

Claims (17)

A radio-frequency power transmission antenna unit in which a flat plate-like coil having a predetermined length of a conductive member is formed of at least three or more layers,
At least one first coil unit having a plurality of turns of a conductive member having a pair of first lead portions and second lead portions on both end sides and being formed of a two-layered plate coil; And
And at least one second coil unit formed by one or more plate-like coils by winding a plurality of times of one conductive member having a pair of third lead portions and fourth lead portions on both end sides,
Wherein the first coil unit is laminated on the second coil unit so that one surface thereof is in contact with one surface of the second coil unit and the second lid part is directly connected to the third lid part. The method according to claim 1,
And the second coil unit is formed of a single-layer flat coil. 3. The method of claim 2,
Wherein the second lead portion includes a lead portion extending outwardly from a side portion of a flat-type coil of the first coil unit which is in contact with the second coil unit,
Wherein the third lead portion is a lead portion extending a predetermined length outward from a body side portion of the second coil unit,
And the fourth lead portion is a lead portion extending from one side of the second coil unit, which is not in contact with the first coil unit, from the center of the body of the second coil unit so as to traverse one side of the second coil unit. The method according to claim 1,
Wherein the second coil unit is formed of a two-layered plate-like coil in which one conductive member is wound a plurality of times. 5. The method of claim 4,
Wherein the antenna unit for wireless power transmission comprises:
The first coil unit is formed of a four-layered plate-like coil laminated on one surface of the second coil unit,
Wherein the second lead portion and the third lead portion are lead portions each extending outwardly from the side portions of two planar coils which are in contact with each other among the four planar coil portions. The method according to claim 1,
And an adhesive layer is disposed on a contact surface of the first coil unit and the second coil unit. The method according to claim 6,
Wherein the adhesive layer comprises a nonconductive component. An antenna unit for wireless power transmission in which a flat plate type coil in which a conductive member having a predetermined length is wound is constituted by at least three or more layers and transmits radio power; And
And a shielding unit disposed on one surface of the antenna unit for wireless power transmission,
Wherein the antenna unit for wireless power transmission comprises:
At least one first coil unit having a plurality of turns of a conductive member having a pair of first lead portions and second lead portions on both end sides and being formed of a two-layered plate coil; And
And at least one second coil unit formed by one or more plate-like coils by winding a plurality of times of one conductive member having a pair of third lead portions and fourth lead portions on both end sides,
Wherein the first coil unit is laminated to the second coil unit such that one surface thereof is in contact with one surface of the second coil unit, and the second lid part is directly connected to the third lid part. 9. The method of claim 8,
Wherein the second coil unit is formed of a single-layer flat coil. 10. The method of claim 9,
Wherein the second lead portion includes a lead portion extending outwardly from a side portion of a flat-type coil of the first coil unit which is in contact with the second coil unit,
Wherein the third lead portion is a lead portion extending a predetermined length outward from a body side portion of the second coil unit,
Wherein the fourth lead portion is a lead portion extending from one side of the second coil unit that is not in contact with the first coil unit from the body center portion of the second coil unit so as to traverse one side of the second coil unit. 11. The method of claim 10,
Wherein the shielding unit includes a receiving recess formed at a predetermined depth on one surface thereof,
And a part or an entire length of the fourth lead portion is inserted and disposed in the receiving groove. 9. The method of claim 8,
Wherein the second coil unit is formed of a two-layered plate-shaped coil in which one conductive member is wound a plurality of times. 13. The method of claim 12,
Wherein the antenna unit for wireless power transmission comprises:
The first coil unit is formed of a four-layered plate-like coil laminated on one surface of the second coil unit,
Wherein the second lead portion and the third lead portion are lead portions each extending outward from the side portions of the two flat plate type coils facing each other among the four flat plate type coils. 9. The method of claim 8,
And an adhesive layer is disposed on a contact surface of the first coil unit and the second coil unit. 15. The method of claim 14,
Wherein the adhesive layer comprises a nonconductive component. 9. The method of claim 8,
Wherein the shielding unit is any one of a ribbon sheet, a ferrite sheet and a polymer sheet including at least one of an amorphous alloy and a nanocrystalline alloy. 17. The method of claim 16,
Wherein the ferrite sheet comprises at least one of Mn-Zn ferrite and Ni-Zn ferrite.

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